I love that German restaurants are getting free publicity from this thread. Yey The Dis!
I've lived near Heidelberg for the last 10 years. I've lived in 5 different states and visited a lot more over the last 30 years. Regional differences are not nearly as marked as they once were.
I double-checked with my hubby, (born and bred in Hessen), and he said my post was spot on. Course you're going to find own recipes the family likes better, that's normal. Do you know which bought Currywurst sauce they meant? We've never seen it in a jar.
When you next go to a Kirmes or the Christmas markets, look for the busiest Bratwurst stands. The condiment tubs have spouts and a handle you push down to pump them out. You probably have to know what you're looking for to recognise them and they're always surrounded by people waiting for their turn so you probably missed them.